Patent GB-555567-A (GB)
Title: An improved maximum demand meter
IPC: G01R11/60
Filed: 1942-09-28
Abstract: 555,567. Supply meters. LANDIS & GYR SOC. ANON. Sept. 28, 1942, No. 13569. Convention date, Oct. 24, 1941. [Class 37] In a maximum demand meter with at least one driver acting from the meter armature on a maximum indicator, which driver is uncoupled from the meter at regular intervals of time, returned to its initial position, and again coupled to the meter, is provided with a time-controlled device which returns the maximum pointer automatically to its zero position after the expiry of a reading or charging period from the maximum position that it has reached within this period, and a recording mechanism which records the return movement of the maximum pointer. The driving disc 1 of the meter is connected with the counting mechanism 2 and with a driver 4, which engages a lug 6 on the maximum indicator 7 and is periodically returned to its zero position 14 by means of a synchronous motor 3 through gearing 5. The motor 3 also drives, through gearing 10, a mechanism 11 moving a driver 12 from its zero position 15. The velocity ratio of the mechanism 11 is such that at the end of a reading or charging period, such as a month, week, or day, the driver 12 moves the maximum pointer 7 by means of a lug 13 to its zero position indicated by dotted lines. A record drum 16 is driven from the synchronous motor 3 through gearing 10, 11, 17. the maximum pointer 7 is secured to a gearwheel 9 meshing with a second gear-wheel 19 carrying an eccentric pin 21. On this is pivoted a recording arm 18 having a tail pin which moves in a rectilinear guide 20. By these means a pencil carried by the arm 18 is moved along a generating line of the cylinder 16, and makes a rectilinear trace. During the return of the maximum hand 7 to its zero position, the gearwheels 9, 19 are rotated and the recording arm 18 draws a line on the cylinder indicating the position attained by the hand 7. The synchronous motor 3 may be replaced by a clock, particularly a calendar clock which takes into consideration the number of days of each month. Alternatively the meter itself may serve as a time element for the determination of the recording periods and of the reading periods, and also as a driving means for the corresponding driver and the recording device, for which purpose the meter receives an additional constant turning moment. The driver may be completely released from the meter at the end. of its travel by means of a device controlled by the driver itself for disconnecting a coupling. The maximum device may be separated from the meter and operated therefrom by remote control through a transmission line and a receiving relay. The record may be made on an interchangeable sleeve of cardboard or on an interchangeable disc. The record carrier (sleeve, disc &c.) may consist of transparent material which may have a surface permitting the wiping out of the record. The carrier may be arranged behind a window in the meter casing so that inspection can be made of the mechanism of the meter. Tht maximum indicator or the driver may be connected to a printing mechanism which, on each return of the maximum pointer to its zero position, prints the corresponding maximum consumption on a surface, for example that of the record carrier.